.calculator{width:min(440px,calc(100vw - 20px));padding:20px;max-height:92dvh;overflow:auto}
.calculator header{position:relative;padding-right:38px}.calculator header h2{font-size:23px}
.calc-toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.calc-toolbar button{padding:8px 12px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink)}
.calc-toolbar [aria-pressed=true]{background:#168ed3;color:white}
#calc-input{font-size:23px;text-align:right;min-width:0;width:100%;font-variant-numeric:tabular-nums}
#calc-result{display:block;min-height:52px;text-align:right;font-size:25px;overflow-wrap:anywhere;color:var(--ink);padding:10px 0}
.calc-keys,.calc-scientific{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}.calc-scientific{grid-template-columns:repeat(5,minmax(0,1fr));margin-bottom:9px}.calc-scientific[hidden]{display:none}
.calc-keys button,.calc-scientific button{min-height:45px;padding:9px 2px;border:1px solid var(--line);border-bottom:3px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);font-size:19px;touch-action:manipulation}.calc-scientific button{font-size:14px;min-height:39px}.calc-keys button.primary{background:#42bdf0;color:#102b3e}
#calc-history-list button{display:block;width:100%;padding:12px;text-align:left;overflow-wrap:anywhere;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink)}#calc-history-list small{display:block;color:var(--muted)}
.familiarity{border:0;display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.familiarity legend{margin-bottom:9px;font-weight:700}.familiarity label{border:1px solid var(--line);border-radius:12px;padding:10px;display:flex;gap:6px;align-items:center;font-size:14px}
.task-tools{flex-wrap:wrap;gap:4px 15px}.task-tools button{font-size:14px}.task-header>.lumi-rig{width:35px}.task-sheet{max-height:90dvh;overflow-y:auto}.task-sheet pre{white-space:pre-wrap;overflow-wrap:anywhere;font-family:inherit}
.math-typeset{display:inline-block;vertical-align:middle;max-width:100%;padding:2px 1px}.math-typeset math{font-size:1.1em}.math-block pre{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.8}.math-block.code pre{white-space:pre;overflow:auto;line-height:1.5}
#tutor-answer,#reasoning-feedback{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.8}.solution li{line-height:1.9}
.trail-label{max-width:155px;font-size:12px;line-height:1.3;text-align:center}.lumi-rig .lumi-eyes{transform-origin:130px 94px}.lumi-rig .lumi-body{animation-duration:6.8s}.lumi-rig .lumi-hand.right{animation-duration:12s}.activity-ball .lumi-body{animation-duration:6.8s}.activity-ball .kicking-foot{fill:#49c9f7;stroke:#b6f4ff;stroke-width:1.5}
.task-shell .lesson-intro{padding-top:12px}.lesson-intro>.lumi-rig{width:125px}.lesson-intro h1{font-size:26px}
@media(max-width:400px){.task-tools button{font-size:12px}.calculator{padding:15px}.trail-label{max-width:130px}}

.calculator{padding:16px;line-height:1.35}.calculator header{display:flex;align-items:center;min-height:34px}.calculator header h2{margin:0;font-size:21px}.calculator .sheet-close{position:sticky;top:0;margin-left:auto;float:right;flex:none;padding:4px 10px;min-height:34px;align-self:start}.calculator header+.micro{margin:6px 0 12px;font-size:11px}.calculator .field{gap:5px;margin:0}.calculator #calc-input{padding:8px 10px;min-height:44px;font-size:21px}.calculator #calc-result{padding:5px 0;min-height:40px;font-size:24px}.calculator .calc-keys button{min-height:38px;padding:4px}.calculator .calc-scientific button{min-height:32px;padding:3px}.calculator .calc-toolbar{margin-bottom:10px}.calculator .calc-toolbar button{padding:6px 10px;font-size:13px}.calculator .calc-keys+.micro{font-size:11px;margin:8px 0}.activity-ball{opacity:1}.activity-ball .activity-prop{top:60px}.activity-ball .lumi-ground{opacity:0}.task-sheet .math-block pre{background:none;padding:0}.task-sheet .math-block{margin:12px 0}